//日期类格式化
Date.prototype.Format = function (fmt) { //author: meizz
    var o = {
        "M+": this.getMonth() + 1, //月份
        "d+": this.getDate(), //日
        "h+": this.getHours(), //小时
        "m+": this.getMinutes(), //分
        "s+": this.getSeconds(), //秒
        "q+": Math.floor((this.getMonth() + 3) / 3), //季度
        "S": this.getMilliseconds() //毫秒
    };
    if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    for (var k in o){
        if (new RegExp("(" + k + ")").test(fmt))
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    }
    return fmt;
}

function format(timestamp) {
    return timestamp?new Date(timestamp).Format("yyyy-MM-dd hh:mm:ss"):"";
}

/*
 函数：计算两个日期之间的天数差值
 */
function dateDiff(date1, date2) {
    var msCount = 24 * 60 * 60 * 1000;
    //alert(Date.parse(date1));
    //alert(Date.parse(date2));
    var diff =  Date.parse(date1) - Date.parse(date2);
    return Math.floor(diff / msCount);
}